Laevisuchus

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Not to be confused with Lewisuchus.

Laevisuchus
Temporal range:
Ma
↓
[1]
Cervical vertebra K20/613 in multiple views
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: Saurischia
Clade: Theropoda
Family: †Noasauridae
Genus: †Laevisuchus
Huene & Matley, 1933
Type species
†Laevisuchus indicus
Huene & Matley, 1933
Synonyms
  • Jubbulpuria tenuis Huene & Matley, 1933

Laevisuchus (

paleontologists Friedrich von Huene and Matley in 1933.[2]

The

lectotype has never been chosen from the syntypes. All remains except GSI K27/696 were lost, though GSI K20/613 was rediscovered in 2012.[3][4] A 2024 revision of the small-bodied theropods from India classified "Jubbulpuria tenuis" as a junior synonym of Laevisuchus, and suggested that other taxa ("Compsosuchus solus" and "Ornithomimoides? barasimlensis") are likely indeterminate abelisaurs.[4]

Description

Laevisuchus was a small bipedal carnivore about the same size as Masiakasaurus, which is estimated to be around 2 metres (6.6 ft) in length.[4] It was described on the basis of cervical (GSI K20/614, GSI K20/613, GSI K27/696) and dorsal vertebrae (GSI K27/588), being distinguished by blunt pre- and postzygapophyses, shorter proportions, and a central neural spine position in dorsal view, unlike the relative Masiakasaurus. Its broader neural arch and deeper incisions in spinopostzygapophyseal laminae differentiate it from Noasaurus.[4] GSI K27/696 features a neural arch significantly broader and longer than the centrum, creating a top-heavy look. Pneumatopores on its sides and uneven joint surfaces accentuate this look, while pronounced parapophyses suggest ventral expansion. The referred caudal vertebrae GSI K20/612 and GSI K27/614 ("Jubbulpuria tenuis") are similar in size and shape, potentially from the same Laevisuchus specimen. The former lacks features such as the transverse processes and neural spine, and the latter is slightly stouter, indicating a more proximal tail position.[4] A partial right dentary RTMNU/DG/VERT/1/55P/2020, shares features with the noasaurid Masiakasaurus, and, while it wasn't formally referred to as Laevisuchus, it was suggested to come from it or a related form.[4]

"Jubbulpuria tenuis" vertebrae, now referred to Laevisuchus

Classification

dinosaurs

Laevisuchus was originally classified by Huene as a "

coelurid" similar to but smaller than Coeluroides, another poorly known theropod from the Lameta Formation.[7]

In 2024, Laevisuchus was recovered as a Noasauridae, specifically in an unresolved position outside the clade that includes Masiakasaurus and Noasaurus; also, Jubbulpuria tenuis was synonymised with Laevisuchus.[4]

See also

References

  1. ISBN 978-93-80998-08-4
    .
  2. ^ F. v. Huene and C. A. Matley, 1933, "The Cretaceous Saurischia and Ornithischia of the Central Provinces of India", Palaeontologica Indica (New Series), Memoirs of the Geological Survey of India 21(1): 1-74
  3. ^ Mohabey, Dhananjay M.; Sen, Subhasis; Wilson, Jeffrey A. (2013). "India's first dinosaur, rediscovered" (PDF). Current Science. 104 (1): 34–37.
  4. ^
    ISSN 0272-4634
    .
  5. ISBN 0-520-24209-2
  6. doi:10.22179/REVMACN.6.74
    .
  7. ^ Huene, F. von (1932). "Die fossile Reptil-Ordnung Saurischia, ihre Entwicklung und Geschichte: Monographien zur Geologie und Palaeontologie". 1e Serie, Heft 4: 1–361. Retrieved 8 February 2024.
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